Can different atoms have the same number of valence electrons? Use examples from your data table and explain how this is possible according to the periodic ...
Which gives the most information about the 3D structure of the molecule, the Lewis structure or the molecular model? Page 3. 10B – LEWIS STRUCTURES AND VSEPR / ...
Lewis structures and VSEPR - Essential Chemistry Teacher Lab Manual | PASCO
10B LEWIS STRUCTURES AND VSEPR Part 1 Analysis Lewis structures of atoms Table 1 Lewis structures of atoms Atom Symbol (draw Lewis structure here) Total number of electrons in atom Number of valence electrons Number of lone pairs of electrons Number of unpaired electrons Number of bonds that can form Model color for atom Number of holes on model atom H C N O P Cl Part 1 Questions Lewis structures of atoms 1. What is the relationship between bonds that can form and holes on the model atom? 2. Can different atoms have the same number of valence electrons? Use examples from your data table and explain how this is possible according to the periodic table. PASCO / EC-6352 1 10B LEWIS STRUCTURES AND VSEPR / STUDENT HANDOUT 3. Carbon is a key element in the formation of living things. Why is the number of bonds carbon makes important for living things? 4. Does the absence of holes on an atom always indicate the presence of lone pairs of electrons? Why or why not? Part 2 Analysis Lewis Structures of molecules Table 2 Lewis structures of molecules Lewis Structure Structural formula Chemical Formula Part 2 Questions Lewis structures of molecules 1. Which gives the most information about valence electrons, the Lewis structure or the molecular model? 2. Which gives the most information about the 3D structure of the molecule, the Lewis structure or the molecular model? 2 PASCO / EC-6352 Part 3 Analysis VSEPR Table 3 VSEPR Chemical formula Lewis Structure 10B LEWIS STRUCTURES AND VSEPR / STUDENT HANDOUT Number of bonding electron domains Number of non- bonding electron domains Molecular shape of central atom H2O PCl3 CO2 CH4 CH2O Part 3 Questions VSEPR 1. Molecules with 2 bonding electron domains on the central atom can be either linear or bent. Which molecules from Table 3 have 2 bonding electron domains? Which is linear and which is bent? PASCO / EC-6352 3 10B LEWIS STRUCTURES AND VSEPR / STUDENT HANDOUT 2. Molecules with 3 bonding electron clouds can be trigonal planar (flat) or trigonal pyramidal. Which molecules from Table 3 have 3 bonding electron domains? Which is trigonal planar, and which is trigonal pyramidal? 3. Compare the Lewis structures of the molecules you built. What causes the shape of a central atom to change from linear to bent, or from planar to pyramidal? Explain your answer. 4. Molecules with 4 bonding electron domains and 0 non-bonding electron domains have a tetrahedral shape. Which molecules from Table 3 have a tetrahedral shape? 5. For the molecule below, identify the geometry of each of the four central atoms (N, C, C, O) based on the electron domains. Verify your answer by building the molecule. 4 PASCO / EC-6352Adobe PDF Library 20.9.95